[ticket/12882] Update search_type when it's not prefixed by phpbb_search

PHPBB3-12882
[ticket/12882] Use a new migration

PHPBB3-12882
Merge pull request #2767 from Nicofuma/ticket/12882

[ticket/12882] Update search_type when it's not prefixed by phpbb_search

* Nicofuma/ticket/12882:
  [ticket/12882] Use a new migration
  [ticket/12882] Update search_type when it's not prefixed by phpbb_search